1331212212 has 48 divisors (see below), whose sum is σ = 3765048000. Its totient is φ = 403397280.

The previous prime is 1331212187. The next prime is 1331212241. The reversal of 1331212212 is 2122121331.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559087 + ... + 561462.

It is an arithmetic number, because the mean of its divisors is an integer number (78438500).

Almost surely, 2^1331212212 is an apocalyptic number.

1331212212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1331212212 is an abundant number, since it is smaller than the sum of its proper divisors (2433835788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1331212212 is a wasteful number, since it uses less digits than its factorization.

1331212212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120573 (or 1120565 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1331212212 is about 36485.7809564219. The cubic root of 1331212212 is about 1100.0584574994.

Adding to 1331212212 its reverse (2122121331), we get a palindrome (3453333543).

The spelling of 1331212212 in words is "one billion, three hundred thirty-one million, two hundred twelve thousand, two hundred twelve".